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<p>At 700&#xa0;°C, salt was applied to the surface of the samples. Under the conditions of 1.5&#xa0;&#xa0;vol% O<sub>2</sub>, 8800&#xa0;ppm HCl and the remaining N<sub>2</sub>, high-temperature chlorine-induced corrosion tests were conducted for 80&#xa0;h on three kinds of IN 718 alloys with different Al contents. The corrosion behavior of the three alloys is mainly pitting corrosion. The porous microstructure rich in Ni in the internal corrosion area seriously affects the corrosion protection of the three materials. However, due to the highest Al content and the smallest grain size of 2.6Al alloy, the sufficient Al element has enough energy to have the fastest migration rate at the grain boundary path, thereby forming the densest surface oxide film and having the most excellent high-temperature chlorine corrosion resistance.</p>

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Chlorine-induced corrosion behavior of IN 718 alloys with different Al contents at 700 °C

  • 期刊论文

  • 发表日期：

    2026年4月27日

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  • Jiawei Liu,
  • Chuanbo Zheng,
  • Guo Yi,
  • Qijie Gao,
  • Yaojun Gong,
  • Han Ma,
  • Jiming Zhang,
  • Xianju Hu

摘要

At 700 °C, salt was applied to the surface of the samples. Under the conditions of 1.5  vol% O2, 8800 ppm HCl and the remaining N2, high-temperature chlorine-induced corrosion tests were conducted for 80 h on three kinds of IN 718 alloys with different Al contents. The corrosion behavior of the three alloys is mainly pitting corrosion. The porous microstructure rich in Ni in the internal corrosion area seriously affects the corrosion protection of the three materials. However, due to the highest Al content and the smallest grain size of 2.6Al alloy, the sufficient Al element has enough energy to have the fastest migration rate at the grain boundary path, thereby forming the densest surface oxide film and having the most excellent high-temperature chlorine corrosion resistance.